【英文标准名称】:Opticalfibres-Part1-41:Measurementmethodsandtestprocedures-Bandwidth
【原文标准名称】:光纤.第1-41部分:测量方法和试验规程.频带宽度
【标准号】:IEC60793-1-41-2010
【标准状态】:现行
【国别】:国际
【发布日期】:2010-08
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/SC86A
【标准类型】:()
【标准水平】:()
【中文主题词】:频带宽度;定义;尺寸规格;电气工程;光纤;频率;频率范围;测量;测量技术;动量;多模纤维;光学测量;光波导;特性;脉冲失真;抽样方法;试验;试验装置
【英文主题词】:Bandwidths;Definitions;Dimensions;Electricalengineering;Fibreoptics;Frequencies;Frequencyranges;Measurement;Measuringtechniques;Momentum;Multimodefibres;Opticalmeasurement;Opticalwaveguides;Properties;Pulsedistortion;Samplingmethods;Testing;Testingdevices
【摘要】:ThispartofIEC60793describesthreemethodsfordeterminingandmeasuringthemodalbandwidthofmultimodeopticalfibres(seeIEC60793-2-10,IEC60793-30seriesandIEC60793-40series).Thebasebandfrequencyresponseisdirectlymeasuredinthefrequencydomainbydeterminingthefibreresponsetoasinusoidalymodulatedlightsource.Thebasebandresponsecanalsobemeasuredbyobservingthebroadeningofanarrowpulseoflight.Thecalculatedresponseisdeterminedusingdifferentialmodedelay(DMD)data.Thethreemethodsare:?MethodA–Timedomain(pulsedistortion)measurement?MethodB–Frequency-domainmeasurement?MethodC–Overfilledlaunchmodalbandwidthcalculatedfromdifferentialmodedelay(OMBc)MethodsAandBcanbeperformedusingoneoftwolaunches:anoverfilledlaunch(OFL)conditionorarestrictedmodelaunch(RML)condition.MethodCisonlydefinedforA1a.2(andA1a.3inpreparation)multimodefibreandusesaweightedsummationofDMDlaunchresponseswiththeweightscorrespondingtoanoverfilledlaunchcondition.Therelevanttestmethodandlaunchconditionshouldbechosenaccordingtothetypeoffibre.
【中国标准分类号】:M33
【国际标准分类号】:33_180_10
【页数】:64P.;A4
【正文语种】:英语


【英文标准名称】:Resistancewelding-Weldability-Assessmentofweldabilityforresistancespot,seamandprojectionweldingofmetallicmaterials
【原文标准名称】:电阻焊.可焊性.金属材料的电阻点焊、缝焊和凸焊的可焊性评定
【标准号】:BSENISO18278-1-2004
【标准状态】:现行
【国别】:英国
【发布日期】:2004-11-25
【实施或试行日期】:2004-11-25
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:凸阻焊;焊接;点焊;试验;特性;定义;凸缝焊;试样;硬化过程;电阻焊接;焊接工艺;焊接接头;金属;电阻点焊;焊缝;焊接工程;材料;评定;测量;可焊性试验;硬度测量;规范(验收);金属材料;凸焊;缝焊;硬度试验;滚压焊接;可焊性;金属焊接
【英文主题词】:
【摘要】:SO18278-1:2004recommendsproceduresfordeterminingthegenericweldabilityforresistancespot,seamandprojectionweldingofmetallicmaterials.Thisprocedureisapplicablefortheassessmentoftheweldabilityofuncoated/coatedsteels,stainlesssteelsandnon-ferrousalloyssuchasaluminium,titanium,magnesiumandnickelandtheiralloysofsinglethicknesslowerthanorequalto5mm.Theweldabilityofmetallicmaterialsinresistanceweldingisdefinedintermsof:theabilitytomaketheweldinthefirstplace;theabilitytocontinuemakingwelds;theabilityoftheweldtowithstandtheimposedservicestresses.TheproceduresrecommendedinISO18278-1:2004canbeusedto:comparetheweldabilityofdifferentmetallicmaterials;comparetheweldingresponseofparticularweldingequipmentandallowcomparisonsbetweendifferentequipmentanddeterminetheinfluenceofthestatic/dynamicpropertiesofdifferentweldingequipment;determinetheweldabilityofamaterialwhenanyweldingconfigurationischangede.g.electrodematerialand/orshape,watercoolingrequirementsetc.;investigatetheeffectofweldingparameterssuchasweldingcurrent,weldtime,electrodeforceorcomplexweldingschedulesincludingpulsewelding,currentsteppingetc.onweldability.
【中国标准分类号】:J33
【国际标准分类号】:25_160_10
【页数】:14P;A4
【正文语种】:英语